BONE GRAFT SHAPER
A bone graft shaper for shaping bone graft. The bone graft shaper includes a first holder having at least one shaped slot and a second holder coupled to the first holder, such that the first and second holder are sized and shaped to grasp the bone graft. A cutting guide is also included and has at least one slot. The cutting guide is coupled to one of the first holder and the second holder. The bone graft shaper also includes a bone saw sized and shaped to fit within at least one of the shaped slot and the cutting guide slot.
Latest DEPUY PRODUCTS, INC. Patents:
The present invention relates generally to an instrument for use in orthopaedic surgery, and more particularly to an instrument for shaping bone graft.
BACKGROUNDDuring the lifetime of a patient, it may be necessary to perform a total shoulder replacement procedure on the patient as a result of, for example, disease or trauma. In a total shoulder replacement procedure, a humeral component having a head portion is utilized to replace the natural head portion of the arm bone or humerus. The humeral component typically has an elongated intramedullary stem that is utilized to secure the humeral component to the patient's humerus. In such a total shoulder replacement procedure, the natural glenoid surface of the scapula is resurfaced or otherwise replaced with a glenoid component that provides a bearing surface for the head portion of the humeral component.
In response to shortcomings associated with two-piece glenoid component designs, a number of one-piece glenoid components have heretofore been designed. In regard to such one-piece designs, a body portion, having a bearing surface defined therein for receiving the head of the humeral component, has a number of attachment pegs integrally formed therewith. The attachment pegs are advanced and thereafter secured into a corresponding number of holes that are drilled in the glenoid surface of the scapula by use of bone cement. An example of such a one-piece glenoid component that is designed to be secured to the scapula by use of bone cement is disclosed in U.S. Pat. No. 5,032,132 issued to Matsen, III et al.
Certain one-piece glenoid components have been designed to include finned-pegs, such as described in U.S. Pat. No. 6,911,047, which is herein incorporated by reference in its entirety. The fins act as barbs when the pegs are inserted into holes drilled in the scapula, securing the glenoid component to the scapula.
Some one-piece glenoid components include steps or augments to fill in bone defects in the glenoid. Some stepped glenoid components are described in U.S. Pat. No. 6,699,289 entitled “Augmented Glenoid Component Having an Interrupted Surface and Associated Method for Securing the Augmented Glenoid Component to a Glenoid Surface of a Scapula”, filed on Dec. 31, 2001 and granted on Mar. 2, 2004, which is incorporated by reference herein in its entirety. The augment fits within a prepared defect of the glenoid. However, the stepped glenoids only come in certain sizes. Sometimes the defect is between sizes, or is larger than the largest size. In those instances, a surgeon may desire to use bone graft to fill the defect.
Currently, some surgeons utilize the resected humeral head to prepare the bone graft. However, there is not a shaper or other instrument that guides the surgeon in the preparation of the cuts. Instead, some surgeons make a trace of the defect on sterile paper and then shape the resected humeral head by hand. This takes a long time in the operating room and is very imprecise. Another concern is that, without the use of instruments, the surgeon often holds the resected head in his/her hand while cutting, risking injury to his/her hands.
Therefore, there is a need for an instrument to efficiently and adequately shape bone graft to fit a glenoid defect.
SUMMARY OF THE INVENTIONAccording to one embodiment of the present invention, a bone graft shaper for shaping bone graft is provided. The bone graft shaper includes a first holder having at least one shaped slot and a second holder coupled to the first holder, such that the first and second holder are sized and shaped to grasp the bone graft. A cutting guide including at least one slot is also included. The cutting guide is coupled to one of the first holder and the second holder. A bone saw is sized and shaped to fit within at least one of the shaped slot and the cutting guide slot.
According to another embodiment of the present invention, a method for preparing bone graft is provided. The method includes resecting bone from a patient. The resected bone is clamped in a bone graft shaper, which includes a holder having at least one shaped slot and a cutting guide having at least one slot. A saw is used to cut through the at least one slot in the cutting guide and to cut through the at least one shaped slot of the holder.
According to yet another embodiment of the invention, a bone graft shaper for shaping a resected humeral head for use in a prepared glenoid is provided. The bone graft shaper includes a first holder having a plurality of curved slots and a second holder coupled to the first holder, such that the first and second holder are sized and shaped to grasp the resected humeral head. A cutting guide is also included and has a plurality of slots. The cutting guide is coupled to one of the first holder and the second holder. A bone saw is also included and is sized and shaped to fit within at least one of the plurality of curved slots and the plurality of cutting guide slots.
For a more complete understanding of the present invention and the advantages thereof, reference is now made to the following description taken in connection with the accompanying drawings.
Embodiments of the present invention and the advantages thereof are best understood by referring to the following descriptions and drawings, wherein like numerals are used for like and corresponding parts of the drawings.
Referring now to
Turning now to
As shown in
Turning now to
The humeral head 32 is resected as is known in the art (step s100). The resected humeral head 32 is shown in
As shown in
At step s106, the bone graft shaper is turned over and the cutting saw 28 is inserted through one of the plurality of slots 26. Each of the plurality of slots 26 corresponds to a different width. Because the bisected, resected head 32 is being shaped to fit a defect in the glenoid, the slots 26 define what the width of the resulting bone graft will be. This width will match the width of the prepared glenoid defect. In the embodiment illustrated in
At step s108, the saw 28 is inserted through one of the plurality of shaped slots 22 as shown in
The shaped bisected, resected head 32 is shown in
Although the above steps state that the cutting guide slot 26 is cut first and that the shaped slot 22 is used second, the cutting may take place in either order.
Turning now to
As with the bone graft shaper 10, the bone graft shaper 110 is used to shape a bone graft, which in this illustrated embodiment is a bisected, resected humeral head 32. As shown in
In some embodiments, the D-shaped slot 126 on the cutting guide 124 may not be d-shaped, but may be a one or a plurality of straight line slots, like those shown in the cutting guide 24 of
The first holder 112 is shown with a single shaped slot 122. In other embodiments, there may be a plurality of shaped slots 122 as with the shaped slots 22 of
In some embodiments, the shapers 10, 110 may be made of stainless steel. In other embodiments, the shapers 10, 110 may be made of plastic. Other materials may also be used.
The above embodiments both describe using the bone graft applicator to shape bone graft using a resected humeral head. However, the bone graft shaper may also be used to shape bone graft using other resected bone, such as patellas, femoral heads, distal femurs, proximal tibias, etc. . . . It should also be reiterated that as stated above, that such a bone graft shaper would also work on artificial or cadaveric bone. The shaper of the present invention may also be used to create bone graft shaped to fit in other areas besides glenoids. For example, the bone graft could be shaped to fit within an acetabular cavity, a distal femur, or a proximal or distal tibia.
Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions, and alterations could be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims
1. A bone graft shaper for shaping bone graft, the bone graft shaper comprising:
- a first holder having at least one shaped slot;
- a second holder coupled to the first holder, such that the first and second holder are sized and shaped to grasp the bone graft;
- a cutting guide including at least one slot, the cutting guide coupled to one of the first holder and the second holder;
- a bone saw sized and shaped to fit within at least one of the shaped slot and the cutting guide slot.
2. The bone graft shaper of claim 1, wherein the cutting guide is integrally connected to the one of the first holder and second holder.
3. The bone graft shaper of claim 2, wherein the cutting guide extends perpendicularly outward from the one of the first holder and the second holder.
4. The bone graft shaper of claim 1, wherein the cutting guide includes a plurality of slots.
5. The bone graft shaper of claim 1, wherein the first and second holders each include a handle sized and shaped to be grasped by a user and the handles are pivotally connected to one another.
6. The bone graft shaper of claim 1, wherein the bone graft is a bisected, resected humeral head and the first holder is curved to grasp the bisected, resected humeral head.
7. The bone graft shaper of claim 1, wherein at least one of the first holder and the second holder includes texture sized and shaped to grasp the bone graft.
8. The bone graft shaper of claim 7, wherein the texture is teeth.
9. The bone graft shaper of claim 1, wherein the shaped slot is angled in the first holder.
10. The bone graft shaper of claim 1, wherein the shaped slot is curved.
11. The bone graft shaper of claim 1, further including a base sized and shaped to receive the bone graft, wherein the first and second holders extend perpendicularly upward from the base.
12. The bone graft shaper of claim 10, wherein the cutting guide is a plate that is perpendicular to the first and second holders and parallel to the base.
13. The bone graft shaper of claim 11, wherein the slot in the plate is D-shaped to replicate the shape of a glenoid defect.
14. The bone graft shaper of claim 11, wherein the base and plate include holes and the bone graft shaper further includes posts that fit through the holes of the base and the plate, affixing the plate in a position relative to the base.
15. A method for preparing bone graft, the method comprising:
- resecting bone from a patient;
- clamping the resected bone in a bone graft shaper, the bone graft shaper including a holder having at least one shaped slot and a cutting guide having at least one slot;
- using a saw to cut through the at least one slot in the cutting guide; and
- using the saw to cut through the at least one shaped slot of the holder.
16. The method of claim 15, wherein the cutting guide includes a plurality of slots, and the method includes using the saw to cut through one of the plurality of slots, the one of the plurality of slots corresponding to a particular width of the resulting bone graft.
17. The method of claim 15, wherein the holder includes a plurality of shaped slots, and the method includes using the saw to cut through one of the plurality of slots, the one of the plurality of slots corresponding to a particular height of the resulting bone graft.
18. A bone graft shaper for shaping a resected humeral head for use in a prepared glenoid, the bone graft shaper comprising:
- a first holder having a plurality of curved slots;
- a second holder coupled to the first holder, such that the first and second holder are sized and shaped to grasp the resected humeral head;
- a cutting guide including a plurality of slots, the cutting guide coupled to one of the first holder and the second holder;
- a bone saw sized and shaped to fit within at least one of the plurality of curved slots and the plurality of cutting guide slots.
19. The bone graft shaper of claim 18, wherein the cutting guide is integrally connected to the one of the first holder and second holder.
20. The bone graft shaper of claim 18, further including a base sized and shaped to receive the resected humeral head, wherein he first and second holders extend perpendicularly upward from the base.
Type: Application
Filed: Mar 31, 2011
Publication Date: Oct 4, 2012
Applicant: DEPUY PRODUCTS, INC. (WARSAW, IN)
Inventors: SARAH M. ANTHONY (WARSAW, IN), JOSEPH P. IANNOTTI (WARSAW, IN), KYLE E. LAPPIN (WARSAW, IN), MATTHEW T. STONE (WARSAW, IN), JOANNA L. SURMA (WARSAW, IN), DAVID M. WARLOP (WARSAW, IN)
Application Number: 13/077,196
International Classification: A61B 17/56 (20060101);